EPT
Save me from failing math :(
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QuanticHawk
United States32080 Posts
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Gyabo
United States329 Posts
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QuanticHawk
United States32080 Posts
![[image loading]](http://www.webassign.net/www25/symImages/5/8/65a6bc6cf506841edab9daa8ec889c.gif) ![[image loading]](http://www.webassign.net/www25/symImages/8/a/a77ea49ae7af133d16a16e8ba552dc.gif) (x + 8)2 = 36x these are the frist three equations. I missed last weeks lesson to go to the rangers game, so im playing catch up >< im doing #3 now, i think i got it ![[image loading]](http://img90.imageshack.us/img90/8902/fuckmathyo8.png) | ||
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SpiritoftheTunA
United States20903 Posts
probably | ||
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Night[Mare
Mexico4793 Posts
![[image loading]](http://img.photobucket.com/albums/v348/guxtav-/algebra.gif) click to enlarge | ||
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Night[Mare
Mexico4793 Posts
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QuanticHawk
United States32080 Posts
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QuanticHawk
United States32080 Posts
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Rotodyne
United States2263 Posts
x2 + -20x + 36 Reorder the terms: 36 + -20x + x2 Factor a trinomial. (2 + -1x)(18 + -1x) Final result: (2 + -1x)(18 + -1x) http://www.algebrahelp.com/calculators/equation/factoring/ | ||
Insane
United States4991 Posts
Think about the different factors of 36, then find two which add up to 20 (well, or negative 20, but if they add up to 20 you can just negate both  ).1 * 36 2 * 18 3 * 12 4 * 9 6 * 6 Do you see two which add up to 20? Those will determine which two constant numbers you have in your factored solution. Edit: Or I suppose you could just do the whole problem for him -____-. Re-ordering so that x is on the right is weird, by the way. | ||
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QuanticHawk
United States32080 Posts
yeah im used to it on the left. | ||
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Rotodyne
United States2263 Posts
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QuanticHawk
United States32080 Posts
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Gyabo
United States329 Posts
On April 05 2008 11:05 Hawk wrote: im sitll confused on the first one. i need to get it to standard form, and i hate dealing with fractions, so i'd have to multiply by the lcd (28) ? You don't need to worry about the lcd for problem 1. (4/7)t² = 7/4 Multiply both sides by 7/4 to get t² by itself. t² = 49/16 Now take the square root of both sides to get t. t = 7/4 | ||
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Insane
United States4991 Posts
Add 7/4 to both sides, then divide by 4/7 on both sides (so that you are getting t² on its own side) (dividing by 4/7 is the same as multiplying by 7/4). Then square root both sides and you end up with t = something (which I won't tell you so you still have something to do note that when you are going to take the square root you should have something of the form y/z, where y and z are both perfect squares, so you don't need a calculator to do the square roots)Basically the strategy is to move everything except for t to the right side of the equation and leave t on the left side. At the end to make sure your answer is correct, plug the value you got for t back into the original equation and make sure that the left side really does equal the right side. Edit: jesus christ, beaten again -___- Edit2: made one of the sentences read a little nicer  | ||
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QuanticHawk
United States32080 Posts
this online program sucks. it like defeats learning because i can only submit my answers 3 times before they are recorded and the assistance thing doesnt work when i have questions >< somehow i got 3 wrong?? (x + 8)^2 = 36x x^2 + 16x + 36 - 36x = 0 (set to standard form) x^2 - 20x + 36 = 0 (x - 18) (x -2 ) = 0 zero property for each means x = 18 and x = 2 ? | ||
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Insane
United States4991 Posts
(x + 8)^2 = x^2 + 8x + 8x + 64 = x^2 + 16x + 64, not + 36 I didn't notice you were trying to factor the wrong thing since I only read the last post and didn't read earlier ones since I figured they had already been addressed :/ | ||
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QuanticHawk
United States32080 Posts
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infinity21
Canada6683 Posts
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thoraxe
United States1449 Posts
[spoiler]damn nerds + Show Spoiler + no offense | ||
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